【摘要】 分析了交错控制输入串联输出并联组合式双管正激变换器输入端不均压现象及其起因。在此基础上提出新的控制策略。采样输入端串联分压电容电压的偏差,分时叠加于两交错串联模块主开关管的瞬时电流采样信号,应用峰值电流控制原理,直接调节两主开关管的占空比,实现其输入端功率均衡及均压。仅用一个交错PWM控制芯片和一个电压调节器,就可以同时实现对该组合式变换器的交错PWM、输出稳压和输入均压的综合控制,无需额外的同步电路和均压控制器。1kW样机的仿真和实验结果验证了该方法的有效性和可行性。更多还原

【Abstract】 Novel control for an input-series and output- parallel dual two-transistor forward converter (ISOP-DTTFC) is proposed, based on the analysis and result on the voltage unbalance. With peak current control, the sampled error voltage between the input capacitors is introduced directly to the PWM pulse generation circuit and both the output voltage and input-voltage-sharing are controlled. Then the proposed control is implemented. All the functions of interleaving PWM, output voltage control and input voltages balance are achieved with only a single PWM IC and a voltage regulator without any extra synchronizing or voltage sharing control circuit. Simulation and experimental results with a 1kW prototype are presented to verify the analysis and control proposed.更多还原